Does A2220 iphone 11 pro max work outside china/hongkong well?

It will work anywhere it the world, however, you can only get it serviced in or out of warranty in the country where it was purchased.

In addition, it will have some software limitations imposed by the Chinese government.

As far as I know, A2220 is sold only in China and Hong Kong. Hence, it should be only working on those regions (I mean the network carrier, LTE bands or something).

Refer to this link: https://www.apple.com/lae/iphone/LTE/ and you will find that phone is only available on

China mainland, Hong Kong, and Macao (wow, never thought that it will work on Macao).